A rotor balance detection device for a double harvester motor

Abstract

The present invention relates to the field of rotor detection technology, specifically a rotor balance detection device for a double harvester motor, comprising a base, wherein the front and rear sides of the top of the base are fixedly provided with a bracket for placing the rotor, and the bracket is provided with two rolling bearings for receiving the rotor shaft and a detector for detecting the balance of the rotor. This rotor balance detection device for a double harvester motor, through spiral fitting transmission and dynamic contact enhancement technology, in the process of the lifting platform driving the belt frame downward, cooperates with the elastic release mechanism of the tensioning wheel to make the belt dynamically fit the rotor surface along a spiral trajectory, forming a contact area with a continuous gradient distribution. Compared with traditional single-point contact, this design increases the contact area, reduces the fluctuation of the friction coefficient, effectively suppresses the transmission slip phenomenon, improves the stability of torque transmission, significantly controls the speed fluctuation, and significantly improves the signal-to-noise ratio of the data collected by the detector.

Description

Technical Field

[0001] The present invention relates to the technical field of rotor detection, and in particular to a rotor balance detection device for a double harvester motor. Background Art

[0002] As the core power equipment of modern agricultural machinery, the rotor of the motor of a double harvester must maintain dynamic balance under high speed, high load, and complex vibration conditions. Traditional balance detection technology is mostly designed for industrial motors, using a fixed support structure and single-point contact drive. Existing detection devices generally have the following technical defects:

[0003] Insufficient contact transmission stability: Traditional belt drives rely on linear angular contact. When there is slight eccentricity or wear on the rotor surface, the belt can easily slip, causing distortion in the test data.

[0004] Weak lateral vibration suppression capability: Conventional roller restraint mechanisms can only provide single-side limit. The lateral centrifugal force generated by the high-speed rotation of the rotor will cause resonance in the detection tooling, increasing the measurement error.

[0005] Lack of safety protection mechanism: When the belt breaks or the rotor falls out during the inspection process, there is a lack of active braking and mechanical locking functions, posing a risk of equipment damage and personnel safety.

[0006] As intelligent harvesters develop towards high power and lightweight, the problem of excessive vibration of the entire machine caused by uneven rotor mass distribution is becoming increasingly prominent. The industry urgently needs a detection solution with the following characteristics:

[0007] Highly robust transmission: adapts to rotor diameter tolerances and surface topography changes, maintaining high transmission efficiency at a certain linear speed;

[0008] Multi-dimensional dynamic constraint: synchronously suppress radial runout and axial movement;

[0009] Fail-safe redundancy: Mechanical self-locking and energy dissipation are achieved in the event of sudden overload or structural failure.

[0010] Based on the above background, this patent proposes a rotor balance detection device specifically for double harvester motors. Through the three core technologies of spiral trajectory closed-loop transmission, pneumatic-mechanical dual-mode locking, and eccentric self-locking emergency braking, it overcomes the adaptability bottleneck of traditional equipment under complex agricultural working conditions and provides underlying technical support for reliability improvement and intelligent detection of harvester motors. Summary of the Invention

[0011] The present invention aims to provide a rotor balance detection device for a tandem harvester motor to address the issues raised in the aforementioned background art, namely, insufficient contact transmission stability, weak lateral vibration suppression, and the lack of safety protection mechanisms. To achieve this objective, the present invention provides the following technical solution: a rotor balance detection device for a tandem harvester motor, comprising a base, with rotor mounting brackets fixedly mounted on both the front and rear sides of the base's top. The brackets are equipped with two rolling bearings for receiving the rotor shaft and a detector for detecting rotor balance.

[0012] Brackets with lifting functions are fixedly arranged on the left and right sides of the top of the base, and the two brackets are connected by a crossbeam. Lifting platforms are slidably arranged on the brackets, and a belt rack is fixedly installed between the lifting platforms.

[0013] Three pulleys are rotatably arranged in the belt frame, and belts for driving the rotor are sleeved on the three pulleys. The belt frame is provided with a motor for driving the pulleys and a tensioning pulley for adjusting the belt tension. When the lifting platform drives the belt frame downward, the belt spiral fits the surface of the rotor.

[0014] The side surface of the belt rack is fixed with two front-to-back staggered pipe seats, the bottom of the pipe seats is movably connected to the sliding column, the sliding column and the slide are linked by the inclined rail, and when the sliding column moves upward, it pushes the slide to move horizontally.

[0015] The end of the slide is provided with a roller that cooperates with the belt. When the two rollers move relative to each other, the belt is wound into a closed loop to restrict the lateral runout of the rotor.

[0016] Preferably, a through hole is opened at one end of the drum relative to the rotor, a tubular caliper is slidably connected in the through hole, a tension spring for pulling the caliper to slide inward is provided in the through hole, and a shaftless fan blade is fixedly provided inside the caliper.

[0017] When the drum is rotated by the belt, the shaftless fan blade pushes the caliper out through the airflow, and the two calipers engage with each other to lock the drums and the slide on both sides.

[0018] Preferably, a transverse axis is fixed to the side surface of the slide, a slide groove is provided at one end of the roller relative to the transverse axis, an axle seat is slidably connected in the slide groove, the axle seat is rotatably connected to the transverse axis, and a top spring is provided in the slide groove.

[0019] When the reaction force of the belt squeezes the roller, the roller axis is coaxial with the horizontal axis. After the belt breaks, the top spring pushes the roller axis to dislocate and squeezes the fixed belt with eccentric rotation.

[0020] Preferably, the tensioning wheel is connected to the belt frame via a spring tensioning structure, and the spring tensioning structure is used to adjust the position of the tensioning wheel along the belt transmission direction.

[0021] Preferably, the detector includes a vibration sensor and a rotation speed sensor, and the vibration sensor and the rotation speed sensor are connected to an external controller via a data line.

[0022] Preferably, the lifting function of the bracket is realized by a hydraulic cylinder, and the surface of the bracket is provided with scale lines for marking the lifting stroke.

[0023] Preferably, a guide rail is provided between the pipe seat and the slide column.

[0024] Preferably, a buffer pad is embedded in the inner wall of the slide groove, a friction-reducing coating is coated on the surface of the shaft seat, and a dust-proof sleeve is sleeved on the outer side of the top spring.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] In the present invention, through spiral fitting transmission and dynamic contact enhancement technology, during the downward pressing process of the lifting platform driving the belt frame, the elastic release mechanism of the tensioning pulley is cooperated to make the belt dynamically fit the rotor surface along a spiral trajectory, forming a contact area with a continuous gradient distribution. Compared with traditional single-point contact, this design increases the contact area, reduces the fluctuation of the friction coefficient, effectively suppresses the transmission slippage phenomenon, improves the torque transmission stability, significantly controls the speed fluctuation, and significantly improves the signal-to-noise ratio of the data collected by the detector.

[0027] In the present invention, a double closed-loop constraint adaptive balancing system is used, and a front-to-back staggered arrangement of a pipe seat and a sliding column linkage mechanism is adopted. The vertical displacement is converted into a horizontal displacement through the inclined rail-bump 19 mechanical pair, and the double-sided rollers are driven to realize a closed-loop belt structure. When the belt forms a closed-loop enveloping the rotor, the contact width is expanded to 2.8 times that of the traditional structure, generating a radial constraint force field. This structure can compress the lateral runout of the rotor, and at the same time compensate for the rotor diameter tolerance through the self-adjustment function of the roller, ensuring the full-range adaptability of rotors of different specifications.

[0028] In the present invention, a fail-safe double locking protection system is adopted and an innovative pneumatic-mechanical hybrid locking mechanism is integrated. During normal operation, the airflow thrust of the shaftless fan blades overcomes the resistance of the tension spring, so that the caliper forms an interlocking structure, eliminating the displacement deviation of the roller. When the belt breaks, the top spring pushes the roller axis and the horizontal axis to produce an angle, triggering the eccentric rotation of the roller and forming a wedge-shaped friction pair with the base, thereby realizing full-area braking of the moving parts. This mechanism can withstand a kinetic energy impact of 200J, limiting the displacement of the broken belt to a safe range of 10cm, while keeping the rotor displacement less than 2mm, thus building a dual safety guarantee of active protection and passive emergency response. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 2 A top view of the present invention;

[0031] Figure 3 It is a structural schematic diagram of the belt rack and the belt of the present invention;

[0032] Figure 4 It is a structural schematic diagram of the belt frame and the pulley of the present invention;

[0033] Figure 5 It is a structural schematic diagram of the tube base and the slide of the present invention;

[0034] Figure 6 It is a sectional view of the three-dimensional structure of the pipe rack of the present invention;

[0035] Figure 7 It is a three-dimensional structural cross-sectional view of the drum of the present invention;

[0036] Figure 8 This is a cross-sectional view of the structure of the horizontal shaft, shaft seat and roller of the present invention;

[0037] Figure 9 This is a schematic structural diagram of the drum and shaftless fan blades of the present invention;

[0038] Figure 10 This is a schematic diagram of the belt of the present invention circulating along the rotor.

[0039] In the figure: 1. Base; 2. Card holder; 3. Rolling bearing; 4. Detector; 5. Bracket; 6. Crossbeam; 7. Lifting platform; 8. Belt rack; 9. Pulley; 10. Belt; 11. Motor; 12. Tensioner; 13. Pipe seat; 14. Slide column; 15. Inner groove; 16. Outer groove; 17. Slide; 18. Inclined rail; 19. Bump; 20. Roller; 21. Through hole; 22. Caliper; 23. Tension spring; 24. Shaftless fan blade; 25. Cross shaft; 26. Slide groove; 27. Shaft seat; 28. Top spring. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technical personnel in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] See also Figures 1 to 10 The present invention provides a technical solution: a rotor balance detection device for a double harvester motor, comprising a base 1, wherein the front and rear sides of the top of the base 1 are fixedly provided with a bracket 2 for placing the rotor, and the bracket 2 is provided with two rolling bearings 3 for supporting the rotor shaft, and the bracket 2 is provided with a detector 4 for detecting the rotation balance of the rotor.

[0042] Brackets 5 with lifting functions are fixedly provided on the left and right sides of the top of the base 1. The tops of the two brackets 5 are connected by a single crossbeam 6, and a lifting platform 7 for lifting is slidingly provided on the outside of the bracket 5. The bracket 5 adopts a two-stage hydraulic cylinder with a linear guide rail. Redundant guide columns are provided on both sides of the lifting platform 7. An anti-shake damping module is added in the middle of the lifting stroke. The hydraulic system has a built-in pressure compensation valve to prevent the double brackets from lifting asynchronously. A belt rack 8 is fixed between the two lifting platforms 7.

[0043] The belt frame 8 is internally rotated with three pulleys 9, on which a belt 10 for driving a rotor is sleeved, and the belt frame 8 is provided with a motor 11 for driving the pulleys 9. The belt frame 8 is provided with a tensioning pulley 12 that cooperates with the belt 10. The tensioning pulley 12 has a built-in pressure sensor, and the spring tensioning structure is integrated with a micro servo motor. The tension of the belt 10 is dynamically adjusted through a PID algorithm, and the tension value is fed back to the controller in real time to ensure stable belt transmission efficiency at different speeds.

[0044] When the lifting platform 7 drives the belt frame 8 to move downward, it presses the belt 10 down on the rotor. After being released by the tensioning pulley 12, the relatively inclined belt 10 adheres to the rotor surface along a spiral trajectory, thereby increasing the contact area between the belt 10 and the rotor and improving transmission stability. When the belt frame 8 descends, the tensioning pulley 12 releases the belt length, and in conjunction with the lateral displacement of the roller 20, the belt 10 covers the rotor surface with a helical angle of 15°-25°, increasing the contact area by 40%.

[0045] Two tube seats 13 are fixedly provided on the side surface of the belt frame 8, and the two tube seats 13 are staggered front and back along the two ends of the belt frame 8. The tube seats 13 are set as hollow structures. A sliding column 14 is movably inserted at the bottom of the tube seat 13, and an inner through groove 15 is provided on the side surface of the sliding column 14. An outer through groove 16 communicating with the inner through groove 15 is provided on the side surface of the tube seat 13, and a slide 17 is slidably connected in the outer through groove 16 and the inner through groove 15. The side surface of the slide 17 is fixedly connected with an inclined rail 18, and a protrusion 19 cooperating with the inclined rail 18 is fixedly provided on the inner side wall of the inner through groove 15. When the sliding column 14 drives the protrusion 19 to move upward, it pushes the slide 17 to move horizontally along the inclined rail 18.

[0046] The side surface of the end of the slide 17 is provided with a roller 20‌‌ that cooperates with the belt 10, and the roller 20 is located on the upper part of the belt body on the lower side of the belt 10‌‌. When the two rollers 20 are relatively displaced, the belt 10 is attached to the surface of the rotor in a closed loop, thereby forming a closed loop belt body of the belt 10 outside the rotor, and utilizing a larger and wider contact surface to assist the belt 10 in restraining the rotor and controlling the lateral runout of the rotor.

[0047] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figures 5 to 10 As shown, a through hole 21 is provided at one end of the roller 20 relative to the rotor, and a tubular caliper 22 is slidably connected in the through hole 21. A tension spring 23 is provided in the through hole 21 to pull the caliper 22 to slide inward, and a shaftless fan blade 24 is fixedly provided inside the caliper 22. When the two rollers 20 are rotated by the belt 10, the shaftless fan blade 24 pushes the caliper 22 to pop out through the airflow, and the two calipers 22 are relatively engaged to prevent the rollers 20 and the slide 17 on both sides from moving back to each other, thereby utilizing the locked rollers 20 to stably wrap the belt 10 around the outside of the rotor.

[0048] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figures 5 to 10 As shown, a transverse axis 25 corresponding to the roller 20 is fixed to the side surface of the slide 17, and a slide groove 26 is provided at one end of the roller 20 relative to the transverse axis 25. An axle seat 27 is slidably connected in the slide groove 26, and the axle seat 27 is rotatably connected to the transverse axis 25. A top spring 28 is provided in the slide groove 26, and the top spring 28 pushes the roller 20 to deviate from the axis of the transverse axis 25 along the axle seat 27. When the roller 20 relatively displaces and pushes the belt 10, the reaction force of the belt 10 squeezes the roller 20 to displace along the axle seat 27. At this time The axis of the roller 20 is coaxial with the axis of the horizontal axis 25. The roller 20 can rotate along with the belt 10. After the belt 10 breaks, the roller 20 loses the external force, and the top spring 28 pushes the axis of the roller 20 to be misaligned with the axis of the horizontal axis 25. At this time, a belt locking area is formed between the roller 20 that rotates eccentrically due to inertia and the base 1, and the belt 10 is squeezed and fixed along the base 1 to prevent the broken belt 10 from popping out and causing a safety hazard. The belt 10 can also be used to lock the rotor to prevent the high-speed rotating rotor from falling out due to the broken belt 10.

[0049] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figures 5 to 10 As shown, the tensioning wheel 12 is connected to the belt frame 8 through a spring tensioning structure. The spring tensioning structure is used to adjust the position of the tensioning wheel 12 along the transmission direction of the belt 10. The spring tensioning structure automatically adjusts the position of the tensioning wheel 12 through the elastic potential energy of the pre-compressed spring, and compensates for the length deformation of the belt 10 caused by temperature changes or long-term stretching in real time.

[0050] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figures 5 to 10 As shown, the detector 4 includes a vibration sensor and a speed sensor, which are connected to an external controller via a data line. The controller is integrated with a balance analysis algorithm module based on the rotor vibration spectrum. The vibration sensor and the speed sensor work together to achieve high-precision detection through the balance analysis algorithm in the controller.

[0051] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figures 5 to 10 As shown, the lifting function of the bracket 5 is realized by a hydraulic cylinder. The surface of the bracket 5 is provided with scale lines for marking the lifting stroke. The hydraulic cylinder drives the lifting platform 7 to slide along the bracket 5, and cooperates with the laser-engraved scale lines on the surface to achieve precise positioning.

[0052] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figures 5 to 10 As shown, a guide rail is provided between the tube seat 13 and the slide column 14 , and a linear ball guide rail is used between the tube seat 13 and the slide column 14 to ensure the translation stability of the slide 17 .

[0053] In this embodiment, Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figures 5 to 10 As shown, a buffer pad is embedded in the inner wall of the slide groove 26, the surface of the shaft seat 27 is coated with a friction-reducing coating, and a dust-proof sleeve is provided on the outer side of the top spring 28. The buffer pad can attenuate 80% of the high-frequency vibration energy, thereby reducing the deflection noise of the roller 20. The friction-reducing coating reduces the rotation resistance of the shaft seat 27, and the dust-proof sleeve prevents dust from invading. The service life of the top spring 28 is increased to 500,000 times.

[0054] The use method and advantages of the present invention: When the rotor balance detection device of the double harvester motor is in operation and use, the working process is as follows:

[0055] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figures 5 to 10 As shown:

[0056] S1. After the controller is started, it detects the reset status of the lifting platform 7, the tension value of the belt 10, and the communication status of the sensor 4 to ensure that the pressure of the lifting hydraulic system is stable ≥5MPa, and the inverter of the motor 11 is in standby mode. The rotor specification diameter, weight, and target speed range are input through the external controller. The system automatically matches the lifting stroke, the belt tension threshold value (default 200-400N), and the balance tolerance ISO standard level;

[0057] S2. Place the rotor shafts at both ends on the rolling bearings 3 of the tray 2. Adjust the rotor position so that its axis is aligned with the center of the belt frame 8. The hydraulic cylinder drives the lifting platform 7 downward. The belt frame 8 drives the belt 10 to contact the rotor surface. The tensioning pulley 12 simultaneously releases the belt excess, so that the belt 10 wraps around the rotor with a 15° helix angle. During this process, the slide post 14 is squeezed upward by the base. The inclined rail 18 interacts with the protrusion 19 to push the slide 17 toward the center. The rollers 20 on both sides wrap the belt 10 along the rotor surface to form a closed loop.

[0058] S3, the motor 11 drives the rotor to rotate through the pulley 9. When the belt 10 rotates, the shaftless fan blades 24 generate airflow, pushing the caliper 22 to overcome the resistance of the tension spring 23 and pop out. After the caliper 22 is engaged, it is forced to lock the position of the slide 17.

[0059] S4. When the belt 10 breaks, the top spring 28 instantly pushes the roller 20 away from the axis of the horizontal axis 25, and the eccentric roller 20 squeezes the remaining belt segment, and the static friction locks the rotor.

[0060] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A rotor balance detection device for a double harvester motor, comprising a base (1), characterized in that: A tray (2) for placing the rotor is fixedly provided on both the front and rear sides of the top of the base (1), and the tray (2) is provided with two rolling bearings (3) for receiving the rotor shaft and a detector (4) for detecting the balance of the rotor; Brackets (5) with lifting functions are fixedly provided on the left and right sides of the top of the base (1), the two brackets (5) are connected by a crossbeam (6), a lifting platform (7) is slidably provided on the brackets (5), and a belt rack (8) is fixedly installed between the lifting platforms (7); Three pulleys (9) are rotatably provided in the belt rack (8), and a belt (10) for driving the rotor is sleeved on the three pulleys (9). The belt rack (8) is provided with a motor (11) for driving the pulleys (9) and a tensioning wheel (12) for adjusting the tension of the belt (10). When the lifting platform (7) drives the belt rack (8) to move downward, the belt (10) spirally adheres to the surface of the rotor; The side surface of the belt rack (8) is fixedly provided with two front-to-back offset tube seats (13), the bottom of the tube seat (13) is movably plugged into a slide post (14), and the side surface of the slide post (14) is provided with an inner through groove (15), the side surface of the tube seat (13) is provided with an outer through groove (16) communicating with the inner through groove (15), and a slide (17) is slidably connected in the outer through groove (16) and the inner through groove (15), the side surface of the slide (17) is fixedly connected with an inclined rail (18), and a protrusion (19) matching the inclined rail (18) is fixedly provided on the inner side wall of the inner through groove (15), and when the slide post (14) drives the protrusion (19) to move upward, it pushes the slide (17) to move horizontally along the inclined rail (18); The end of the slide (17) is provided with a roller (20) that cooperates with the belt (10). When the two rollers (20) are relatively displaced, the belt (10) is wound around into a closed loop, thereby restraining the lateral runout of the rotor. A through hole (21) is provided at one end of the roller (20) opposite to the rotor, a tubular caliper (22) is slidably connected in the through hole (21), a tension spring (23) is provided in the through hole (21) for pulling the caliper (22) to slide inward, and a shaftless fan blade (24) is fixedly provided in the caliper (22); When the roller (20) is rotated by the belt (10), the shaftless fan blade (24) pushes the caliper (22) to pop out through the airflow, and the two calipers (22) are relatively engaged to lock the rollers (20) and the slide (17) on both sides.

2. The rotor balance detection device for a double harvester motor according to claim 1, characterized in that: A transverse shaft (25) is fixed to the side surface of the slide (17), and a slide groove (26) is provided at one end of the roller (20) opposite to the transverse shaft (25). The slide groove (26) is slidably connected to a shaft seat (27), and the shaft seat (27) is rotatably connected to the transverse shaft (25). A top spring (28) is provided in the slide groove (26); When the reaction force of the belt (10) squeezes the roller (20), the axis of the roller (20) is coaxial with the axis of the horizontal axis (25). After the belt (10) breaks, the top spring (28) pushes the axis of the roller (20) to be dislocated and rotates eccentrically, squeezing and fixing the belt (10) along the base (1).

3. The rotor balance detection device for a double harvester motor according to claim 2, characterized in that: The tensioning wheel (12) is connected to the belt frame (8) via a spring tensioning structure, and the spring tensioning structure is used to adjust the position of the tensioning wheel (12) along the transmission direction of the belt (10).

4. The rotor balance detection device for a double harvester motor according to claim 3, characterized in that: The detector (4) comprises a vibration sensor and a rotation speed sensor, and the vibration sensor and the rotation speed sensor are connected to an external controller via a data line.

5. The rotor balance detection device for a double harvester motor according to claim 4, characterized in that: The lifting function of the bracket (5) is realized by a hydraulic cylinder, and a scale line for marking the lifting stroke is provided on the surface of the bracket (5).

6. The rotor balance detection device for a double harvester motor according to claim 5, characterized in that: A guide slide rail is provided between the pipe seat (13) and the slide column (14).

7. The rotor balance detection device for a double harvester motor according to claim 6, characterized in that: A buffer pad is embedded in the inner wall of the slide groove (26), a friction-reducing coating is coated on the surface of the shaft seat (27), and a dust-proof sleeve is sleeved on the outer side of the top spring (28).

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